Wide QRS: It is often of ventricular origin. Also seen with Aberrant conduction (Rate-related versus present in sinus). There may be presence of accessory connection. Associated with drug effects. Seen with electrolyte imbalance.

Wide QRS of Aberrancy Fixed bundle branch block
- Common in post-op hearts
- Reflects conduction system disease in unoperated hearts
Rate-related
- Ashman phenomenon
- Failure of bundle to consistently conduct at higher rates
- Usually refractory period of right bundle is more than left bundle

WHY IS IT REQUIRED?- To determine if tachycardia is present
- To determine the mechanism of tachycardia
- For drug testing if tachycardia is present
- To locate the origin of critical structures
- Ablation of the origin of critical structures

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